RegExMakker — Online Regex Playground & Tester
De ultieme regex playground voor Nederlandse developers
Why Developers Choose RegExMakker
Build, Test & Perfect Regular Expressions in Real Time
Stop guessing whether your regex works. RegExMakker gives you instant visual feedback as you type — match highlights, capture group breakdowns, and a live explanation of every token. Trusted by over 42,000 developers across the Netherlands and Belgium since 2021.
Real-Time Match Visualization
Type a pattern and see matches highlight instantly in your test string. Every capture group is color-coded and numbered, so you know exactly what each part of your expression is pulling out. No need to run or refresh — feedback is immediate.
Step-by-Step Pattern Breakdown
RegExMakker parses your expression and explains each token in plain language. See what `\d{3}-\d{4}` means before you commit it to production code. The breakdown panel updates live as you edit, making it the fastest way to learn regex syntax.
Flags & Options Explorer
Toggle case-insensitive (`i`), multiline (`m`), dotall (`s`), and Unicode (`u`) flags with a single click. See how each flag changes your results in the output panel. The tool supports ECMAScript 2024, PCRE, and Python regex flavors.
Save & Share Regex Snippets
Save your patterns to a personal library with tags and descriptions. Share any regex via a unique URL — teammates see the exact pattern, test string, and flags you used. Over 18,000 public snippets are already available in the community library.
Common Patterns Library
Start from proven patterns for emails, phone numbers, IPv4/IPv6 addresses, URLs, Dutch BSN numbers, IBAN validation, and more. Each pattern includes a description, sample matches, and edge-case warnings. Browse by category or search by name.
Performance & Safety Checks
RegExMakker warns you about catastrophic backtracking risks before they crash your application. The performance meter estimates match time complexity and flags patterns that could cause ReDoS vulnerabilities. Keep your code fast and secure.
What Developers Say
Trusted by Thousands of Developers
RegExMakker is the go-to regex tool for frontend engineers, backend developers, and DevOps professionals who need reliable patterns fast.
Sanne de Vries — Senior Frontend Engineer, Bol.com
"I used to spend 20 minutes debugging a single regex in console.log. With RegExMakker I built a validation pattern for our product SKU format in under 3 minutes. The step-by-step breakdown finally made lookaheads click for me."
Thomas Jansen — Full-Stack Developer, Booking.com
"The ReDoS warning saved our staging environment last quarter. RegExMakker flagged a pattern that was causing exponential backtracking on malformed input. We fixed it before it ever reached production. This tool is now required reading for our team."
Lotte van den Berg — DevOps Engineer, Adyen
"We use RegExMakker for log-parsing patterns in our ELK stack. The ability to paste a 500-line log sample and see exactly which lines match — with capture groups labeled — cuts our pipeline development time in half. The shareable links are a huge plus for code reviews."
Ready to Build Better Regex?
Start Testing Regular Expressions for Free
No signup required. No rate limits. Open the playground, type a pattern, and see results instantly. Whether you're validating a Dutch phone number or parsing server logs, RegExMakker has you covered.